Furnace



Patented Aug.. Il, l925.

Unirse STATES WILLIAM IVI. DUNCAN, OF ALTON, ILLINQIS.

FURNACE.

Application filed August 28, 1922. Serial No. 584,748.

T all whom t may concern:

Be it known that I, WILLIAM M. DUNCAN, a citizen of the United States of America, a resident of Alton, in the county of Madison, State of Illinois, have invented certain new and useful Improvements in Furnaces, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

This invention relates to improvements in furnaces, and more particularly to a furnace equipped with a traveling chain grate from which heat is transmitted to a boiler or the like. The main object of the invention is to produce a simple, efficient and inexpensive structure of this kind including a traveling grate located beyond the vertical projection of the boiler, where it will not weaken the boiler support nor require expensive excavations below the boiler.

The traveling chain grate is preferably located in a combustion chamber adjacent to but entirely beyond the projection of the boiler, and the grate travels in a course approximately at a right angle to the boiler. A flame outlet at one side of the combustion chamber provides for the delivery of heat to the boiler, and the flame moves transversely of the grate to pass through the flame outlet. Consequently, a very narrow grate can be used to obtain a wide llame below the boiler, and this results in a saving in the initial cost of the mechanical stolrer,

' the width of the flame being determined by the length of the grate, instead of by the width of the grate.

With the foregoing and other-objects in View, the invention comprises the novel construction, combination and arrangement of parts hereinafter more specifically described and illustrated in the accompanying drawings, wherein is shownthe preferred embodiment of the invention. However, it is to be understood that the invention comprehends changes, variations and modifications which come within the scope of the claims hereunto appended.

Fig. I is a fragmentary view of one end of a boiler, or still, equipped with a heating plant embodying the features of this invention, the combustion chamber being shown in section.

Fig. II is a fragmentary vertical section taken approximately through the middle of Fig. I.

' A designates a combustion chamber having side walls l and 2, a front wall 3, a rear wallie and a top wall 5, the latter being formed by blocks suspended from hanger bars 6. 7 designates supporting rods, each passing through a row of the blocks 5 and also through some of the hanger bars 6. The hanger bars 6 are supported by channels 8, to which they are secured by means of pins 9, as shown in the drawings.

The side wall. l of the combustion chamber forms the front wall of the heating chamber B, and a flame outlet 10 is formed in the upper portion of wall 1 to provide for the transmission of heat from the combustion chamber A to the heating chamber B. 11 designates a boiler, or still, forming the top wall of the heating chamber B and adapted to be heated by the flame passing through the flame outlet 10. An arch 12 is located adjacent to the top of the llame outlet and directly below one end of the boiler. The boiler and heating chamber lie at approximately a right angle to the combustion chamber A, and said chamber A is preferably located entirely beyond the vertical projection of the boiler.

G designates an endless traveling chain grate arranged in the combustion chamber A. entirely beyond the projection -of the boiler and adapted to travel in a course approximately at a right angle to the boiler. The gratel herein shown is narrower than the boiler, that is, the transverse dimension of the grate is less than the transverse dimension ofthe boiler, and one of its traveling sides is adjacent to the side wall l of the combustion chamber but below the flame outlet l() in said wall to provide for the upward delivery of a relatively wide flame from` the narrow grate and through said flame outlet. The flame passes upwardly from the top of the grate and thence trans- Vversely of the grate, so as to escape through the flame outlet 10 and into the heating chamber B. 'Io pass from the combustion chamber A to the heatingk chamber B, the flame moves away from the right side of the traveling grate II) and across the left side thereof. As an illustration of a suitable traveling grate structure, I have shown endless rows of grate links 13 pivotally connected together at 14 and provided with a rotary drive shaft 15 to which a suit1 able number of drive wheels 16 is secured. The fuel-supporting upper portion of the endless grate travels on itracls 17, andthe lower portion thereof travels on tracks 18. To support the reai' end portion of the grate. each track 17 may bepro'vided with aourved end portion 17, as shown in Fig. I. Draft boXes 19 are arranged transversely of 'the grate to provide for the delivery of a forced draft through the fuel-supporting upper portion of the grate, each draft box being open 'at vthe "top for the discharge ofthe draft- 'and lprovided at one end with'a draft inlet 2O Il) formed in one side "of passageway 21 into which air may be forced 'by vmeans of any suit-able blower. By arranging my grate in the manner illustrated l iiiialie it'possible to employ a grate which is considerably narrower than the arsociated boiler. Heretofore it has been vnecessary that the grate `be vapproximate'ly as wide as the boiler, so that the flame would be evenly distributed over a considerable portion of the boiler. However, because of the arrangement of the grate of the furnace disclosed herein with relation to ythe *boiler `an even distribution of flame over a considerable portion ofthe boiler is obtained with a'con'iparatively narrow `grate The chain grate lis mounted between side walls "22, and to prevent leakage of fuel Yfrom .the grate, closure bars Q3 may be ar- Yrangedon the upper edges of these walls 22 vso as to engage the `traveling side edges of thegrate. E24-'designates tubes located above but adjacenttothe bars 23 so as to confine the fuel.

The endless chaiiiiigrate is'prefei'ably in- 'clineid upwardly from the'front to the rear rof the V'combustion cliainbei A, and the4 bot- 'toniofthe 'flame 'outlet 10 is approximately parallel with'the'incliiiedgrate, as shown by Fig. I. A fuel hopper 25 is located above the lowerend of the inclined grate 'and an ash lcompartment 26 is 'formed below the upper l'end lof said inclined fgrate, 'the ash compartment Vbeing entirely beyond the lvertical projection of the boiler to permit free "removal ofthe 'ashes therefrom. Fuel iiitiodnced intot-he hopper 25 4escapes through thecpeniiig 25 at the .bottom thereof and nntothe top of the traveling grate, the ashes being discharged from the upper end ofthe vgrate andipermitted todrop by gravity into the ash vcompartment 26 at the righthand sideio'f'lligl. j A

lt is iinportantfto observe that the specific- `structure herein disclosed includes a coin- 'bination liaving"`two vmain features, and to obtain the benelicialA results herein pointed 'out each of these features is important. First, the traveling grate is locatedentirely beyond the projection of the boiler where J it can vbe verected without weakening the boiler support and without requiringeXpensive excavations below the boiler. Thisl materially reduces the cost of the structure the ashes.

"and provides for the discharge of ashes at a point entirely beyond the boiler, thus avoiding the use of expensive means for removing Second, to produce an entirely .practicable structure having these advantages, the grate travels in a course approximately at a rightangle to the boiler, and a wide flame passes transversely of the grate and away from one side thereof to enter the space below the boiler.

`I claim: I

1. Av furnace provided with a combustion chamber, a heating chamber at oneside of said combustion chamber, said combustion chaiiiber having a flame outlet at said side to provide for the delivery of flame to said heatingchamben a boiler arranged directly bovc said heating chamber but beyond the verticalprojection of said combustion chamber, and a single endless chain .grate arranged in said combustion chamber and traveling in a course vapproximately at a right angle to said boiler, said endless chain grate being narrowerthan said boiler.

2. A furnace `provided with a heating chamber, a boiler arranged directly above said heating chamber and vformingl .part'of the top wallthereof, 4av combustionchainber located ventirely beyond the `'vertical projection of said boiler and heating cliam'v-ber, a single endless chain grate arranged in said combustion chamber and traveling `in a course approximately at a right angle to said boiler', one side of 'said endless chain grate being adjacent to but beyond the vertical projection of said boiler land vheating chamber, and one side of said combustion chamber being in free and direct communica- .tion with said heating chambei to Anrfovide for the delivery of iiai'ne across said'side of the grate, Vsaid endless chain grate being narrower than said boiler.

1 -A furnace provided 'with a boiler, a

Ycombustion chainbcr'located adjacent to one end of the boiler but entirely beyond theveitical-projectionof the boiler. one kside of 'eL-td combustion chamber having a Vflame"'ontlet leading tothe boiler, and a singleen'dless `traveling chain grate narrower Vthan said boiler, ysaid `grate being in said 'combustion chamber beyond the boiler and traveling in a course approximately at aright angle to lthefboiler, andone of thesi'desv ofsaid grate being-adjacentto but lower thansaid flame voutlet to provide 'for the `upward Adelivery of a'relatively wide vflame from the narrow grate and through said flame outlet.

Ll-p A furnace ,provided with a coinbustio.`

chamber, a heating chamberat lonefside of said combustion chamber, Asaid combustion chamber having a iame outlet at said side to v.provide for the delivery of'flameito'said heating chainber,'a boiler arranged directly above said heating chamber but beyond the vertical projection of said combustionchamlfii) ber, an endless chain grate arranged in saidl combustion chamber and traveling in a course approximately at a right angle to said boiler, one of the sides of said grate being adjacent to said side of the combustion chamber and below said flame outlet to provide Jfor the delivery of flame across said side oit' the grate, said endless grate being inclined upwardly from the front to the rear cf said combustion chamber, and the bottom et' said flame outlet being approximately parallel with the inclined grate, a fuel hopper located, above the lower end of the inclined grate, and an ash compartn'ient below the upper end of said inclined grate, said ash compartment being entirely beyond the vertical projection of said boiler.

5. A furnace provided with a combustion chamber, a heating chamber at one side of said combustion chamber, said combustion chamber having a fla-me outlet at said side to provide for the delivery of flame to said heating chamber, a boiler arranged directly above said heating chamber but beyond the vertical projection of said combustion chamber, an endless chain grate arranged in said combustion chamber and traveling in a course approximately at a right angle to the axis of the boiler, one of the sides of said grate being adjacent to said side of th. con/lbustion chamber and below said llame outlet to provide for the delivery of flame across said side of the grate, a fuel hopper located above one end of said grate, and an ash compartment below the other end of said grate, said ash coi'upartment being entirely beyond the vertical projection of said boiler.

In testimony that claim the foregoing I hereunto aiiiX my signature.

VILLIAM M. DUNCAN. 

